Signal-weighted density is a BM25 Drafts diagnostic that weights each covered term by how strongly its presence tracks with ranking position across the current SERP, so terms that separate top pages from lower ones count for more than terms everyone uses.
| Term | Signal-Weighted Density |
|---|---|
| Category | Content and Topical Relevance |
| Also known as | Weighted Contextual Density |
| Where it appears | BM25 Drafts |
What it means in RankGear
Inside BM25 Drafts, RankGear does not treat every term you cover as equally important. Signal-weighted density looks at the ranking field for your target query and asks, for each term, how closely its usage lines up with where a page sits in the results. Terms that the strongest pages lean on more heavily than the weaker ones carry more weight in the score; terms that appear roughly everywhere, regardless of position, are discounted. The result is a density read that reflects a term’s discriminating power in this SERP rather than a flat count of how often something is mentioned.
How to interpret it
Read it as a coverage-and-clarity guide, not a target to hit. A low signal-weighted density usually means your draft is missing the terms that actually distinguish the leading pages, not that you need more repetition of the phrase you already use. The right response is to compare the relevant competitors, see which weighted terms they cover that you do not, and add genuinely useful material that brings those concepts in naturally. Because the weighting is derived from the current results, it shifts as the SERP shifts.
| Reading | What it tells you |
|---|---|
| Low weighted density, high raw density | You are repeating common terms but missing the ones that separate top pages |
| Rising weighted density as you add sections | New material is covering discriminating terms, not just filler |
Example
Suppose you are drafting a page on “cold brew coffee ratios.” Your draft mentions the phrase often, so raw density looks healthy, yet signal-weighted density stays low. Comparing the ranking field shows the leading pages consistently discuss steep time, grind coarseness, and dilution ratio, terms that clearly separate them from thinner pages. Adding substantive coverage of those concepts raises the weighted score because you are now covering the terms that carry signal in this SERP, not because you repeated the head phrase more.
Important considerations
- Signal-weighted density is a comparative indicator drawn from the current ranking field; it describes how leading pages differ, and does not measure or predict a Google ranking score.
- Correlation is not causation. A term carrying weight means it distinguishes top pages in this SERP, not that adding it will cause a page to rank.
- The weighting reflects a snapshot of the SERP and changes as the results change, so treat it as a moving guide rather than a fixed target.
- Preserve search intent when you add weighted terms. Repetition, keyword stuffing, and unsupported claims do not build topical authority.
Related terms
Part of the RankGear glossary · how RankGear measures · the 870 factors.